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i <br /> TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH _ Concentration(µg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> IW 1 01/30/91 7 80 3022 -22 42 000 240 44 350 820 3,500 -- <br /> 05/02/91 30 11 -2231 000 150 25 230 520 2,500 -- <br /> 07/16-17191 3107 -2327 000 -- -- -- -- -- <br /> 10/15/91 31 65 -23 85 000 120 36 280 390 3,400 -- <br /> 01/28/92 2991 -22 11 000 130 25 330 500 3,600 -- <br /> 04/30/92 2949 -2169 000 -- -- -- -- __ <br /> 08/13/92 3153 -23 73 000 19 3 7 50 70 650 -- <br /> 10/08/92 32 13 -2433 000 -- -- -- -- -- _ <br /> 02/23/93 2878 -2098 000 <br /> 08/22/93 2770 -1990 000 -- -- -- -- -- __ <br /> 12/30/93 2750 -1970 000 <br /> 02/17/94 2717 -1937 000 -- -- -- -- -- <br /> 05/10/94 28 86 -1906 000 41 7 7 180 230 2,000 -- <br /> 08/02/94 2829 -2049 000 55 3 8 210 240 2,100 -- <br /> 11/01/94 2864 -20 84 000 36 <1 0 170 220 1,900 -- <br /> 02/17/95 2603 -1823 000 73 <25 410 470 5,000 -- <br /> 05/11/95 2347 -1567 000 58 <10 350 400 4,700 -- <br /> 08/24/95 2481 -1701 000 67 5 4 430 420 4,100 -- <br /> 10/19/95 2535 -1755 000 29 <5 0 370 370 4,000 43 <br /> 02/13/96 23 11 -15 31 000 58 <5 0 370 390 5,400 -- <br /> 04/18/96 2080 -1300 000 60 <5 0 470 450 6,100 38 <br /> 08/08/96 2202 -1422 000 -- -- -- -- -- -- <br /> 11/04/96 2246 -1466 000 50 <5 0 320 290 3,800 <25 <br /> 02/03/97 17 87 -1007 000 48 <5 0 300 310 4,300 71 <br /> 05/08/97 690 1752 -1062 000 <2 5 <2 5 170 150 2,600 16 <br /> 08/26/97 1931 -1241 000 17 <2 5 130 97 2,400 14 <br /> 11/11/97 19 85 -1295 000 30 <10 160 I30 2,200 <50 <br /> f%protean1739421 imstorlaplgg30113942gw xls Page l of 41 <br />